Electrical heater



FIG. 1 is a front elevation view of an electrical heater, showing the new design;

FIG. 2 is a right side elevation view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a front, left perspective view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in the drawings illustrate portions of the electrical heater that form no part of the claimed design. 

CLAIM The ornamental design for an electrical heater, as shown and described. 